Android初学之仿微信APP门户界面设计

在Android Studio中进行有关代码的编写和界面效果展示
图标来源于阿里矢量图标库

点击底端相应区域，中间内容会进行相应切换（将对应的Fragment显示，其余的Fragment隐藏），下面展示点击联系人后，中间内容的变化。

同时点击菜单后，该菜单的图标和文字都将切换为绿色。

1. 顶部top.xml
2. 底端bottom.xml
3. 中间内容四个分段fragment.xml
4. 窗体总布局的activity_main.xml
5. 四个分段fragment.xml对应的.java文件
6. 主函数文件MainActivity.java

（布局可以通过设置android:background属性改变背景颜色，文本可以通过设置android:textColor属性改变字体颜色。）

（为节省篇幅此处只给出了第一个垂直式的LinearLayout-聊天菜单）
android:gravity属性可以定义布局内控件的对齐方式，居中、水平居中和垂直居中
android:orientation属性可以定义布局内控件的排列方式，一般有水平式和垂直式

（同样只给出了一个分段，其余三个分段类似）

（包含top、middle、bottom三个部分id，用 include 语句调用顶部和底部导航栏两个xml文件）

(同样只给出点击聊天菜单后显示的分段，其余三个类似)

package com.example.mywork;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.fragment.app.Fragment;

public class Fragment_chat extends Fragment {

    public Fragment_chat() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
//        return super.onCreateView(inflater, container, savedInstanceState);
        return inflater.inflate(R.layout.fragment_chat,container,false);
    }
}

（各组件的初始化操作及点击各菜单的转换操作函数）

package com.example.mywork;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    //Fragment
    private Fragment fragment_first=new Fragment_chat();
    private Fragment fragment_second=new Fragment_contacts();
    private Fragment fragment_third=new Fragment_circle_friend();
    private Fragment fragment_fourth=new Fragment_settings();

    //底端菜单栏LinearLayout
    private LinearLayout linear_first;
    private LinearLayout linear_second;
    private LinearLayout linear_third;
    private LinearLayout linear_fourth;

    //底端菜单栏中的Imageview
    private ImageView imageView_first;
    private ImageView imageView_second;
    private ImageView imageView_third;
    private ImageView imageView_fourth;

    //底端菜单栏中的TextView
    private TextView textView_first;
    private TextView textView_second;
    private TextView textView_third;
    private TextView textView_fourth;


    //FragmentManager
    private FragmentManager fragmentManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE );
        setContentView(R.layout.activity_main);

        initView();
        initFragment();
        initEvent();
        selectFragment(0);
        //将第一个图标设为选中状态
        imageView_first.setImageResource(R.drawable.chat_green);
        textView_first.setTextColor(getResources().getColor(R.color.colorViewPress));
    }

    @Override
    public void onClick(View view) {
        //每次点击之后，将所有的ImageView和TextView设置为未选中
        restartButton();

        switch(view.getId())
        {
            case R.id.chat:
                //选择所点击的菜单对应的图层片段
                selectFragment(0);
                //将该菜单的点击状态置为点击态
                imageView_first.setImageResource(R.drawable.chat_green);
                textView_first.setTextColor(getResources().getColor(R.color.colorViewPress));
                break;
            case R.id.contacts:
                selectFragment(1);
                imageView_second.setImageResource(R.drawable.contacts_green);
                textView_second.setTextColor(getResources().getColor(R.color.colorViewPress));
                break;
            case R.id.circle_friend:
                selectFragment(2);
                imageView_third.setImageResource(R.drawable.circle_people_green);
                textView_third.setTextColor(getResources().getColor(R.color.colorViewPress));
                break;
            case R.id.settings:
                selectFragment(3);
                imageView_fourth.setImageResource(R.drawable.settings_green);
                textView_fourth.setTextColor(getResources().getColor(R.color.colorViewPress));
                break;
            default:
                break;
        }
    }

    //重置菜单的点击状态，设为未点击
    private void restartButton() {
        //设置为未点击状态
        //第一片段
        imageView_first.setImageResource(R.drawable.chat);
        textView_first.setTextColor(getResources().getColor(R.color.black));
        //第二片段
        imageView_second.setImageResource(R.drawable.contacts);
        textView_second.setTextColor(getResources().getColor(R.color.black));
        //第三片段
        imageView_third.setImageResource(R.drawable.circle_people);
        textView_third.setTextColor(getResources().getColor(R.color.black));
        //第四片段
        imageView_fourth.setImageResource(R.drawable.settings);
        textView_fourth.setTextColor(getResources().getColor(R.color.black));
    }

    //初始化中间的部分的图层片段
    private void initFragment(){
        fragmentManager=getSupportFragmentManager();
        FragmentTransaction transaction=fragmentManager.beginTransaction();
        transaction.add(R.id.frame_content,fragment_first);
        transaction.add(R.id.frame_content,fragment_second);
        transaction.add(R.id.frame_content,fragment_third);
        transaction.add(R.id.frame_content,fragment_fourth);
        //提交事务
        transaction.commit();
    }

    //初始化各底端的LinearLayout、ImageView和TextView组件
    private  void initView(){
        linear_first=findViewById(R.id.chat);
        linear_second=findViewById(R.id.contacts);
        linear_third=findViewById(R.id.circle_friend);
        linear_fourth=findViewById(R.id.settings);

        imageView_first=findViewById(R.id.imageView1);
        imageView_second=findViewById(R.id.imageView2);
        imageView_third=findViewById(R.id.imageView3);
        imageView_fourth=findViewById(R.id.imageView4);

        textView_first=findViewById(R.id.textView1);
        textView_second=findViewById(R.id.textView2);
        textView_third=findViewById(R.id.textView3);
        textView_fourth=findViewById(R.id.textView4);

    }

    //初始化点击监听事件
    private void initEvent(){
        linear_first.setOnClickListener(this);
        linear_second.setOnClickListener(this);
        linear_third.setOnClickListener(this);
        linear_fourth.setOnClickListener(this);
    }

    //隐藏所有图层分段
    private void hideView(FragmentTransaction transaction){
        transaction.hide(fragment_first);
        transaction.hide(fragment_second);
        transaction.hide(fragment_third);
        transaction.hide(fragment_fourth);
    }

    //选择相应的图层分段
    private void selectFragment(int i){
        FragmentTransaction transaction=fragmentManager.beginTransaction();
        //调用隐藏所有图层函数
        hideView(transaction);
        switch (i){
            case 0:
                transaction.show(fragment_first);

                break;
            case 1:
                transaction.show(fragment_second);

                break;
            case 2:
                transaction.show(fragment_third);

                break;
            case 3:
                transaction.show(fragment_fourth);

                break;
            default:
                break;
        }
        //提交转换事务
        transaction.commit();
    }

}

小结：在Android Studio中进行仿微信APP门户界面的初步设计，实现了top和bottom导航栏的设计，及中间片段图层之间的隐藏与切换，最后实现了点击菜单后的颜色切换问题。用到了TextView、ImageView、LinearLayout、Fragment组件，了解了点击事件onClick函数的编写。

具体代码已上传至gitee代码仓库

——2021.10.04